Does the Samsung see anything else on your network, and/or does it work with Internet streaming sites, like YouTube? Sounds like either a networking issue with the TV and/or the computer, or a firewall issue on the computer.

What OS is Serviio running on? Are either or both connected via wireless, or are they wired to the network?

My finger of blame points to Microsoft. It wouldn't be the first time that an update messed with Serviio. Most often it has something to do with the Windows firewall settings. The update finds the firewall with settings it feels are "incorrect" and resets them. For me, I don't run the firewall at all. Since the computer is inside my network and no computer connects to my network without my permission, I'm not overly concerned with someone attempting to hack it. Sometimes just reinstalling Serviio will recreate the proper firewall settings.

Since you're running Serviio 1.9, there hasn't been any Serviio updates that could have caused a change. With Samsung it's always a possibility they mucked something up, as their DLNA support is lacking in my opinion. Again, they too have broken things with an update. I don't have an E Series set to know if there's been an update recently.

To be honest, I never use my Samsung Smart Apps any longer. My wife is more comfortable using our Sony Blu Ray player to access Serviio, while I prefer my Roku player. The Samsung DLNA functionality is poor, and the last time I tried using it I could not play any videos requiring transcoding (WTV files mostly).

Chromecast is spotty. Only mediabrowser transcodes but it cuts out randomly and a few files just won't play. Localcast will cast if the video doesn't need transcoding. But mediabrowser is needed for everything else and its hit or miss, will I be able to see the whole video or not.

Been a long 4 months can't wait for an update that fixes mediabrowser for chromecast.